fix session login for non admin users

Author: luffah

src/nextcloud/session.py

@@ -3,6 +3,9 @@
 import requests
 from .compat import encode_requests_password
 
+import logging
+_logger = logging.getLogger(__name__)
+
 
 class NextCloudConnectionError(Exception):
     """ A connection error occurred """
@@ -31,7 +34,7 @@ def __init__(self, url=None, user=None, password=None, auth=None, session_kwargs
         self.auth = None
         self.user = None
         self._set_credentials(user, password, auth)
-        self.url = url
+        self.url = url.rstrip('/')
         self._session_kwargs = session_kwargs or {}
 
     def _set_credentials(self, user, password, auth):
@@ -75,18 +78,35 @@ def login(self, user=None, password=None, auth=None, client=None):
         self._set_credentials(user, password, auth)
         self.session.auth = self.auth
         if client:
-            try:
-                resp = client.with_attr(json_output=True).get_user()
-                if not resp.is_ok:
-                    raise NextCloudLoginError(
-                        'Failed to login to NextCloud', self.url, resp)
-            except requests.exceptions.SSLError as e:
-                self.logout()
-                raise e
-            except Exception as e:
+            self._check_session(client.with_attr(json_output=True), retry=3)
+
+
+    def _check_session(self, client=None, retry=None):
+        def _clear():
+            if self.session:
                 self.logout()
+
+        def _raise(e):
+            if retry:
+                _logger.warning('Retry session check (%s)', self.url)
+                return self._check_session(client, retry=retry - 1)
+            else:
+                _clear()
                 raise e
 
+        try:
+            resp = client.get_user()
+            if not resp.is_ok:
+                _raise(NextCloudLoginError(
+                        'Failed to login to NextCloud', self.url, resp))
+        except requests.exceptions.SSLError as e:
+            _raise(e)
+        except NextCloudConnectionError as e:
+            _raise(e)
+        except Exception as e:
+            _clear()
+            raise e
+
     def logout(self):
         """Log out the authenticated user and close the session.